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Structure of power transmission apparatus

a technology of power transmission apparatus and structure, which is applied in the direction of engine starters, machines/engines, and gears, etc., can solve the problems of slipping of the endless transmitting member on each pulley, difficulty in keeping the output, and difficulty in increasing the tension of the endless transmitting member to a required degree, so as to minimize the slippage increase the tension, and increase the tension of the endless transmitting member

Active Publication Date: 2016-05-03
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system effectively controls slippage of the endless transmitting member on pulleys without the need for precise torque control of the auxiliary device, ensuring reliable engine starting while reducing frictional resistance and wear.

Problems solved by technology

When the above torque range is narrow, it results in a difficulty in keeping the output, as produced by the given accessory, within the torque range at all times.
When the torque, as produced by the given accessory which reverses in the reverse rotation control step, is lower than that causing the tensioner body to extend in the given direction, it will result in a difficulty in increasing the tension of the endless transmitting member to a required degree, which may lead to the slippage of the endless transmitting member on each of the pulleys.

Method used

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  • Structure of power transmission apparatus
  • Structure of power transmission apparatus
  • Structure of power transmission apparatus

Examples

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first embodiment

[0026]FIG. 1 illustrates a power transmission system 1 according to the first embodiment. The power transmission system 1, as referred to herein, is installed in an automotive vehicle, not shown, which is equipped with an internal combustion engine 2. The power transmission system 1 works to transmit output power (i.e., torque), as produced by the engine 2, to a given accessory 11 and other accessories 13 and 15 mounted in the vehicle. The accessories 11, 13, and 15, as referred to herein, are auxiliary electric or mechanical devices which are supplied with or transmit power or torque from or to the internal combustion engine 2. The given accessory 11 will also be referred to below as a first auxiliary device. The accessories 13 and 15 will also be referred to below as second auxiliary devices.

[0027]The power transmission system 1 is, as clearly illustrated in FIG. 1, disposed near the engine 2. The power transmission system 1 includes a driving pulley 4, a given accessory pulley 5,...

second embodiment

[0111]FIG. 5 illustrates the power transmission system 1 according to the second embodiment which is different in physical structure thereof and operation of the reverse rotation step made by the ECU 70 from the first embodiment.

[0112]The power transmission system 1 is also equipped with a position sensor 74 installed on the tensioner body 40. The position sensor 74 measures the distance between the upper body 41 and the lower body 42, that is, an extended / contracted position of the tensioner body 40. The position sensor 74 outputs a signal indicative of the position of the tensioner body 40 to the ECU 70. The ECU 70 analyzes the output from the position sensor 74 and determines the extended / contracted position of the tensioner body 40.

[0113]The prediction of the reversing timing, as made by the ECU 70, will be described below with reference to FIG. 6.

[0114]FIG. 6 is a flowchart of a sequence of logical steps or reversing timing determination program executed by the ECU 70 when or a...

third embodiment

[0133]The power transmission system 1 according to the third embodiment will be described below which is different in how the ECU 70 determines the reversing timing from the first embodiment. Other arrangements are identical, and explanation thereof in detail will be omitted here.

[0134]When it is required to predict the reversing timing when the drive shaft 3 is expected to reverse, the ECU 70 analyzes the output from the angular position sensor 73 to determine the angular position of the given accessory pulley 5 and calculates the reversing timing as a function of the angular position of the given accessory pulley 5 and a target angular position θISG of the given accessory pulley 5 to be achieved in the reverse rotation control step. The target angular position θISG is given by

θISG=(Lb−La) / 2πRISG  (5)

[0135]Specifically, when the reversing timing is reached, that is, the angular position of the given accessory pulley 5, as measured by the position sensor 73, reaches the target angul...

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PUM

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Abstract

A power transmission system transmits power from a drive shaft of an internal combustion engine to a first and a second auxiliary device through a belt. An auto-tensioner extends or contracts to change the tension of the belt. A controller rotates the first auxiliary device in a reverse direction to loosen the belt to cause the auto-tensioner to extend to increase the tension of the belt and calculates a reversing timing when the drive shaft will be reversed as a result of increasing of the tension of the belt. The controller inhibits the tensioner body from contracting immediately before or when the reversing time is reached to keep the tension of the belt at an increased degree, thereby eliminating the slippage of the belt on each pulley without having to finely control the operation of the first auxiliary device when the internal combustion engine is started.

Description

CROSS REFERENCE TO RELATED DOCUMENT[0001]The present application claims the benefit of priority of Japanese Patent Application No. 2013-259996 filed on Dec. 17, 2013, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]This disclosure relates generally to a power transmission apparatus designed to transmit power, as produced by an internal combustion engine, to auxiliary devices.[0004]2. Background Art[0005]There are known power transmission systems which work to transmit output power of an internal combustion engine to a given accessory and other accessories mounted in, for example, an automobile using an endless transmitting member such as a belt. The given accessory is used as, for instance, an engine starter to start the internal combustion engine. The given accessory may be rotated by the output power of the internal combustion engine along with the other accessories in a regenerative mode of operation to generate...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H7/22B60W20/00F02N15/02F16H7/12F16H7/08F02N11/04F02N15/08
CPCF16H7/1281B60W20/00F02N15/02Y10T477/23F16H2007/0861F16H2007/0885Y10S903/909F02N11/04F02N15/08
Inventor NOGUCHI, HITOSHIOKADA, HIROSHIODA, SHUZONAKANO, TOMOAKIYAMASHITA, YOSHIHIROYAMAMOTO, YOUSUKEHARA, KAZUHISA
Owner DENSO CORP
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